Carbonation of Concrete with Fly Ash and Corrosion of Reinforcements in 20 Year Tests


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Title: Carbonation of Concrete with Fly Ash and Corrosion of Reinforcements in 20 Year Tests

Author(s): Masatane Kokubu and Shigeyoshi Nagataki

Publication: Special Publication

Volume: 114


Appears on pages(s): 315-330

Keywords: carbonation; compressive strength; concretes; corrosion; corrosion resistance; corrosion tests; durability; fly ash; steels; reinforcing steels; tests; Materials Research

Date: 5/1/1989

Studies on the carbonation of concrete with fly ash and corrosion of reinforcements have been going on since 1962 at 16 research organizations in Japan. As already reported for intermediate ages, it has been shown that the depth of carbonation can be evaluated by compressive strength at the age of 28 days, which is very common value for specifying the concrete quality regardless of whether or not fly ash has been added. A number of findings have been made concerning the influence of exposure conditions on the depth of carbonation. This paper compiles the final test results at 20-year age, to augment the results previously reported for the intermediate ages. These studies also provide much verification data with respect to the durability of fly ash concrete. These test results are reflected on the Japanese standard specification for concrete cover.